Pediatric Anesthesia · 2004 · 41 citations · 25 references
Caudal tramadol provides better and longer lasting postoperative analgesia than i.v. tramadol. These results also suggest that preoperative caudal tramadol did not provide any clinically perceptible benefits compared with postoperative caudal tramadol.
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Analgesia Mediated by a Direct Spinal Action of Narcotics
Tony L. Yaksh, Thomas A. Rudy · Science · 1976 · 944 citations
Tramadol: pain relief by an opioid without depression of respiration
M D Vickers, D. O’Flaherty, S. M. SZEKELY et al. · Anaesthesia · 1992 · 439 citations · Full text